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    <script>
        //1. Object.is 判断两个值是否完全相等
        console.log(Object.is(120, 120)); //true
        console.log(Object.is(NaN, NaN)); // true
        console.log(NaN === NaN); //false  NaN和任何一个数都不相等，包括它本身
        //2.Object.assign 对象的合并 （如果对象有相同属性，后面的会把前面的相同的属性覆盖）
        const config1 = {
            host: 'localhost',
            port: 3306,
            name: 'root',
            pass: 'root',
            test: 'test'
        };
        const config2 = {
            host: 'http://atguigu.com',
            port: 33060,
            name: 'atguigu',
            pass: '888',
            test2: 'test2'
        }
        console.log(Object.assign(config1, config2));
        //3. Object.setPrototypeOf 设置原型对象， Object.getPrototype
        const school = {
            name: '尚硅谷'
        }
        const cities = {
                xiaoqu: ['beijing', 'shanghai', 'shenzhen']
            }
            //为school设置原型对象(不建议这样做)
        Object.setPrototypeOf(school, cities)
        console.log(Object.getPrototypeOf(school)); //获取原型对象
        console.log(school);
    </script>
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